Python versions below 3.8 are not working with eventlet.ssl

[Rodolfo Alonso]

Eventlet SSL module initializes the same object type differently depending on the Python version.

Error: https://storage.gra.cloud.ovh.net/v1/AUTH_dcaab5e32b234d56b626f72581e3644c/zuul_opendev_logs_3ce/741972/1/check/openstack-tox-py36/3ce4d10/testr_results.html

Snippet: http://paste.openstack.org/show/796149/

[Rodolfo Alonso (rodolfo-alonso-hernandez)]

Adding a break point just before the failing point reported in the snippet, this is the MRO of the objects, depending on the version:

py38:
(<class 'eventlet.green.ssl.GreenSSLSocket'>, <class 'ssl.SSLSocket'>, <class 'socket.socket'>, <class '_socket.socket'>, <class 'object'>)

py36:
(<class 'eventlet.green.ssl.GreenSSLSocket'>, <class 'ssl.SSLSocket'>, <class 'eventlet.greenio.base.GreenSocket'>, <class 'object'>)

In py36, the instance of the class GreenSSLSocket, do not inherit from socket.